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Slow Cooker French Onion Soup

One Pot MealsSlow Cooker Meals

Slow Cooker French Onion Soup – This classic, hearty, DELICIOUS French Onion Soup is prepared in the crock pot, and it’s loaded with incredible flavor, caramelized onions, and CHEESE!

Slow Cooker French Onion Soup, french baguette, gruyere cheese
This fantastic Slow Cooker French Onion Soup makes a hearty meal and it’s SO easy to make, especially since the slow cooker/crock pot does all the work! Start the soup the night before and come home to a ready-made dinner.

Friends, I have been updating my older recipes on Diethood, and my photos, for the past 3 months like it’s nobody’s business, and this Slow Cooker French Onion Soup finally got to see its new and improved version since its time when I first introduced it to you in November of 2012! Can’t believe I’ve been at this food blog shenanigans for like, 6 years. WOOOT! HIGH FIVES, please!

French Onion Soup, soup bowls, bread, cheese

Okay, so, anyhow!

SLOW COOKER FRENCH ONION SOUP! Baby, YESSS! This stuff is so, so fantastic. I can’t even. I can only advise you to make it right away just to see what the delicious fuss is all about.

  • There are TWO WAYS to making this French Onion Soup; I will show you both ways:
    First, we can make it all in the crock pot, from beginning to end, and that will take a good 12 hours.
    Secondly, we can partially make it on the stove top and finish it off in the slow cooker.

It’s up to you as to how you want to make it.

Slow Cooker soup, crock pot french onion, caramelized onions

HOW TO PREPARE FRENCH ONION SOUP ENTIRELY IN THE SLOW COOKER

  1. You are going to grab 6 large onions and slice them… get ready for some real tears, but it’s all worth it, I promise. Sweet onions are best for this soup, but you can also use yellow onions, if that is all you have on hand.
  2. Transfer sliced onions to the slow cooker, add in melted butter, salt, pepper, and a bit of sugar. If using yellow onions, I advise to add about a teaspoon of sugar. If using sweet onions, 1/4 teaspoon is all you will need.
  3. Next, you are going to set the slow cooker on LOW and let it cook for like 8 hours, or until onions are browned and caramelized, just as you see them in that photo above. When I make this soup, I always start to prepare it around 10 pm, and then in the morning I just add the rest of the ingredients and finish it up in 4 hours.
  4. Right before serving, slice up a baguette, ladle soup into ovenproof bowls, place one slice of bread inside each bowl, sprinkle shredded gruyere cheese over the bread and soup, and broil for a couple minutes or until cheese is melted.

You can also make a quicker version of this soup by starting it off on the stove top:

French Onion Soup, caramelized onions

  1. Combine onions, butter, sugar, salt, and pepper in a large skillet, and cook the onions for about 25 minutes, or until browned and caramelized.
  2. Transfer the onions to the slow cooker, add in beef broth, wine, thyme, salt, and pepper, and cook for 6 hours on LOW.
  3. When soup is ready, ladle it into ovenproof bowls, place a slice of baguette in each bowl, top with shredded cheese, and broil for couple minutes, or until cheese is melted.

Slow Cooker French Onion Soup, bread, cheese, soup bowls

This soup is mostly served as a starter, but considering how good it is, I could make a meal out of it. Bring on the bread and cheese!

MORE SOUPS:

ENJOY!

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5 from 3 votes
Slow Cooker French Onion Soup - This classic, hearty, DELICIOUS French Onion Soup is prepared in the crock pot, and it's loaded with incredible flavor, caramelized onions, and CHEESE!
Slow Cooker French Onion Soup
Prep Time
10 mins
Cook Time
11 hrs 40 mins
Total Time
12 hrs
 

This classic, hearty, DELICIOUS French Onion Soup is prepared in the crock pot, and it's loaded with incredible flavor, caramelized onions, and CHEESE!

Course: Soup
Cuisine: French
Servings: 6 serves
Calories: 468 kcal
Ingredients
  • 6 sweet onions, thinly sliced (you can also use yellow onions, but up the sugar to 1 teaspoon)
  • 4 tablespoons unsalted butter melted
  • 1/4 teaspoon sugar
  • 1/2 teaspoon salt
  • 1/2 teaspoon fresh ground pepper
  • 4 to 6 sprigs fresh thyme
  • 1 bay leaf
  • 6 cups fat free, low sodium beef broth
  • 1/2 cup dry white wine
  • salt and pepper , to taste
  • 6 slices french bread optional
  • 1 1/2 cups shredded gruyere cheese, optional (if you can't find gruyere, use swiss cheese)
Instructions
  1. Place sliced onions in a 6 quart slow cooker.

  2. Stir in melted butter, sugar, salt, and pepper.

  3. Top with thyme and bay leaf, COVER and cook on LOW for about 8 hours, or until onions are browned and caramelized. Stir half way through. 

  4. Once onions are caramelized, stir in the beef broth and wine.

  5. Taste for salt and pepper and season accordingly.

  6. Cover and cook on LOW for 4 hours, or on HIGH for 2 hours, or until heated through.

  7. Remove and discard thyme and bay leaf.

  8. Turn the oven-broiler on High.
  9. Ladle soup into ovenproof bowls.
  10. Top the bowls with a slice of french bread and cheese.
  11. Broil in oven until cheese is melted, about 2 to 3 minutes.

  12. Serve.

  13. Please see my notes for a lighter version of this soup, as well as a quicker cooking version. 

Recipe Notes

WW Freestyle SmartPoints without bread and cheese: 4

WW Freestyle SmartPoints with bread and cheese: 12

If watching your calorie/carb intake, omit the bread and cheese.

You can also make a quicker version of this soup by starting it off on the stove top:

  1. Combine onions, butter, sugar, salt, and pepper in a large skillet, and cook the onions for about 25 minutes, or until browned and caramelized.
  2. Transfer the onions to the slow cooker, add in beef broth, wine, thyme, salt, and pepper, and cook for 6 hours on LOW.
  3. When soup is ready, ladle it into ovenproof bowls, place a slice of baguette in each bowl, top with shredded cheese, and broil for couple minutes, or until cheese is melted.
Nutrition Facts
Slow Cooker French Onion Soup
Amount Per Serving
Calories 468 Calories from Fat 135
% Daily Value*
Total Fat 15g 23%
Saturated Fat 8g 40%
Cholesterol 42mg 14%
Sodium 360mg 15%
Potassium 971mg 28%
Total Carbohydrates 62g 21%
Dietary Fiber 4g 16%
Sugars 18g
Protein 18g 36%
Vitamin A 8.5%
Vitamin C 19.3%
Calcium 24%
Iron 18.7%
* Percent Daily Values are based on a 2000 calorie diet.

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39 Responses
  1. Audra

    Just an idea…I am making the soup as I type! I used a vegetable slicer for the onions, no tears! Also another tip is breath through your mouth not your nose, it works! 🙂 thanks for the yummy recipe!

  2. Yup your granny is right , onions are full of vitamins C and I make tea for my kids when they are sick with onion..I know sounds disgusting but with some honey and lemon you could never tell it is with onions(w/peel). I hope your kiddos feel better soon! :*
    Your onion Soup looks fantastic, loving your presentation and recipe is tasty too!

  3. I hope the little one is feeling better and that it’s not spreading around the house. 🙁 Today is a day of coincidences I think. I’m catching up on blog reading tonight and the last post I read was also for French onion soup – which I’ve never had. And even more coincidental, I saw it on a menu this morning and decided I need to try it. I’m loving this slow cooker version – my kind of meal! 🙂

  4. Dan

    This is a great idea that I’ve got to try. My brother once showed up with a scuba mask to chop onions. It seemed to work well for him.

  5. My all time favorite soup….besides corn chowder….is French onion soup!!!! I love your recipe:-) My grandfather makes homemade onion soup that is truly to die for:-) I hope your babies are feeling better, Hugs, Terra

  6. Oh! I hope your lumpy feels better soon 🙁 That’s always a terrible thing to have to see.

    Do love this soup though! Winter is fast approaching in Cayman with temps dropping into GASP the 70s! Believe it or not, that totally calls for slow cookers. Bookmarking this bad boy!

  7. I think I love your idea of changing the beef broth to chicken. I prefer chicken flavor and I will definitely give this recipe and cooking method a try. Onions are very healthy…. and I love them. 🙂

    I hope your sweet baby gets well quickly… I know it’s emotionally and physically tolling for parents when they are sick. My kids have coughs now and I wish I could magically get them better.

    Have a good weekend. ~ Ramona

  8. My husband and I looooooooooooove French onion soup and we order it when it’s available. We’ve made once at home but it’s been a while. I don’t own a slow cooker but maybe I can cook slowly on a cast iron? Looks so delicious!

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Katerina

I'm a cookie-maker, baker-faker & picture-taker! For me, eating is a moment to share, an enjoyment, a passion. I hope you enjoy my recipes!

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